EP0863504A3 - Magneto-optical memory medium and reproducing method thereof - Google Patents

Magneto-optical memory medium and reproducing method thereof Download PDF

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Publication number
EP0863504A3
EP0863504A3 EP98104044A EP98104044A EP0863504A3 EP 0863504 A3 EP0863504 A3 EP 0863504A3 EP 98104044 A EP98104044 A EP 98104044A EP 98104044 A EP98104044 A EP 98104044A EP 0863504 A3 EP0863504 A3 EP 0863504A3
Authority
EP
European Patent Office
Prior art keywords
layer
reproducing
recording
predetermined temperature
recording layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98104044A
Other languages
German (de)
French (fr)
Other versions
EP0863504A2 (en
EP0863504B1 (en
Inventor
Akira Takahashi
Michinobu Mieda
Naoyasu Iketani
Go Mori
Junsaku Nakajima
Yoshiteru Murakami
Junji Hirokane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to EP04003324A priority Critical patent/EP1420400B1/en
Priority to EP04003323A priority patent/EP1422708A1/en
Publication of EP0863504A2 publication Critical patent/EP0863504A2/en
Publication of EP0863504A3 publication Critical patent/EP0863504A3/en
Application granted granted Critical
Publication of EP0863504B1 publication Critical patent/EP0863504B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G11B11/10589—Details
    • G11B11/10593—Details for improving read-out properties, e.g. polarisation of light
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525—Magneto-optical [MO] discs

Abstract

A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.
EP98104044A 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof Expired - Lifetime EP0863504B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04003324A EP1420400B1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof
EP04003323A EP1422708A1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP5137297 1997-03-06
JP51372/97 1997-03-06
JP09051372 1997-03-06
JP63680/97 1997-03-18
JP6368097 1997-03-18
JP6368097 1997-03-18
JP69446/97 1997-03-24
JP6944697 1997-03-24
JP6944697 1997-03-24
JP232227/97 1997-08-28
JP23222797 1997-08-28
JP23222797 1997-08-28

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP04003324A Division EP1420400B1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof
EP04003323A Division EP1422708A1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof

Publications (3)

Publication Number Publication Date
EP0863504A2 EP0863504A2 (en) 1998-09-09
EP0863504A3 true EP0863504A3 (en) 2000-08-30
EP0863504B1 EP0863504B1 (en) 2008-07-30

Family

ID=27462635

Family Applications (3)

Application Number Title Priority Date Filing Date
EP04003324A Expired - Lifetime EP1420400B1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof
EP04003323A Withdrawn EP1422708A1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof
EP98104044A Expired - Lifetime EP0863504B1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP04003324A Expired - Lifetime EP1420400B1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof
EP04003323A Withdrawn EP1422708A1 (en) 1997-03-06 1998-03-06 Magneto-optical memory medium and reproducing method thereof

Country Status (5)

Country Link
US (2) US6147939A (en)
EP (3) EP1420400B1 (en)
KR (1) KR100334413B1 (en)
CN (2) CN100338672C (en)
DE (2) DE69839787D1 (en)

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KR100574734B1 (en) * 1998-08-31 2006-04-28 산요덴키가부시키가이샤 Magneto-optical recording medium
JP3568787B2 (en) * 1998-09-08 2004-09-22 シャープ株式会社 Magneto-optical recording medium and reproducing apparatus
US6456586B1 (en) * 1998-09-10 2002-09-24 Sharp Kabushiki Kaisha Magneto-optical recording medium and process for producing the same
JP3519293B2 (en) * 1998-11-20 2004-04-12 シャープ株式会社 Magneto-optical recording medium, reproducing method of magneto-optical recording medium, magneto-optical recording and reproducing apparatus
JP3519295B2 (en) * 1998-11-30 2004-04-12 シャープ株式会社 Magneto-optical recording medium
JP2000311352A (en) * 1999-04-26 2000-11-07 Sharp Corp Optical disk and optical recording and reproducing device
JP3626050B2 (en) * 1999-11-02 2005-03-02 シャープ株式会社 Magneto-optical recording medium and recording method thereof
JP2001307393A (en) * 2000-04-25 2001-11-02 Canon Inc Magneto-optical reproducing device
JP2002025138A (en) * 2000-07-13 2002-01-25 National Institute Of Advanced Industrial & Technology Optical recording medium and optical recording and reproducing equipment
US6826131B2 (en) 2000-10-11 2004-11-30 Matsushita Electric Industrial Co., Ltd. Magneto-optical recording medium having multiple magnetic layers
US6579635B2 (en) 2000-10-12 2003-06-17 International Business Machines Corporation Smoothing and stabilization of domain walls in perpendicularly polarized magnetic films
JP2002319195A (en) 2001-04-19 2002-10-31 Matsushita Electric Ind Co Ltd Optical disk and method for processing magnetic shielding between tracks in the disk
JP2002319196A (en) 2001-04-19 2002-10-31 Matsushita Electric Ind Co Ltd Optical disk and method for processing magnetic shielding between tracks in the disk
JP2002329352A (en) * 2001-04-27 2002-11-15 Sharp Corp Magneto-optical recording medium
KR100613161B1 (en) * 2002-02-25 2006-08-17 후지쯔 가부시끼가이샤 Magneto-optical recording medium and recording/reproduction apparatus thereof
JP2003338053A (en) * 2002-05-20 2003-11-28 Canon Inc Optical recording medium
JP2005539341A (en) * 2002-09-18 2005-12-22 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Magneto-optical storage medium
JP2005050400A (en) * 2003-07-30 2005-02-24 Canon Inc Magneto-optical recording medium
US20070054152A1 (en) * 2003-11-24 2007-03-08 Electronics And Telecommunications Research Institute Recording layer of magneto-optical storage medium having sublayer and method of fabricating the same
KR100868761B1 (en) * 2006-11-20 2008-11-13 삼성전자주식회사 Data storage device using magnetic domain wall motion
CN105840042B (en) * 2016-03-30 2017-06-30 乐视汽车（北京）有限公司 garage door control method and device
CN107523796B (en) * 2017-07-21 2019-07-05 华侨大学 A kind of preparation method of the rare earth-transition alloy composite materials with wall

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GB2110459A (en) * 1982-11-08 1983-06-15 Kokusai Denshin Denwa Co Ltd Magneto-optical recording system
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EP0498461A2 (en) * 1991-02-08 1992-08-12 Sony Corporation System and method of reproducing signals recorded on a magneto-optic recording medium
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JPH06325418A (en) * 1993-05-12 1994-11-25 Hitachi Maxell Ltd Magneto-optical recording medium
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Also Published As

Publication number Publication date
CN100338672C (en) 2007-09-19
DE69839787D1 (en) 2008-09-11
EP0863504A2 (en) 1998-09-09
DE69836571T2 (en) 2007-10-04
CN1187746C (en) 2005-02-02
EP1420400A1 (en) 2004-05-19
EP1422708A1 (en) 2004-05-26
US6147939A (en) 2000-11-14
EP0863504B1 (en) 2008-07-30
EP1420400B1 (en) 2006-11-29
CN1201227A (en) 1998-12-09
KR19980079926A (en) 1998-11-25
CN1577557A (en) 2005-02-09
KR100334413B1 (en) 2002-06-20
DE69836571D1 (en) 2007-01-11
US6272077B1 (en) 2001-08-07

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